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TaxNo: 6684Genus Masonoceras
Suborder: Tornoceratina
Superfamily: Karagandoceratoidea
Genus: Masonoceras
Qualifier: ge
Author: Work & Manger 2002,p.574
Lower Boundary: low.Tournais.--mid.Tournais. [Tn1--Tn2], 357.5 million years
Upper Boundary: G.typicus--anchoralis-latus Z. base [0, 349 million years